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Crepet, William Louis
Cornell Faculty Member
Positions
- Professor, Plant Biology (BIOPL), College of Agriculture and Life Sciences (CALS)
- Department Chairperson, Plant Biology (BIOPL), College of Agriculture and Life Sciences (CALS)
As Department Chair I am particularly interested in developing departmental preeminence in basic plant biology at a time when progress in basic plant biology research is important to critical societal needs including: the development of strategic responses to the effects of climatic change in vital areas including biodiversity maintenance and agriculture; the development of biomedicinals, and investigations of plant based energy sources. My immediate goal has been to build strength in various facets of plant molecular biology including plant biochemistry with complementary strength in the area of plant systematics including theory and molecular systematics. These emphases will be enhanced by another immediate priority, cultivating the kind of research relationships with other Cornell administrative units that will promote and enhance our research eminence by allowing the Department to enter exciting and important areas of research that would be difficult to engage in in the absence of such collaborations or where synergies derived from these collaborations materially improve the Department's and University's positions in these key areas of research.
Research Areas
- Affiliations
- Research
- Publications
- Teaching
- Service
- Background
- Other
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Affiliations
member of graduate field
Research
research overview
- With respect to my own research, my focus is on establishing a dependable fossil record for the flowering plants that includes reliably identified floral evidence. This approach is unique and informative due to the nature of flowers, the phylogenetic significance of their characters and adaptive significance. Such a record has implications for climate change, molecular evolution, hyper radiations characteristic of the angiosperms and for evaluating ecological-evolutionary hypotheses invoked to explain angiosperm dominance of modern ecosystems. Such research has implications for systematics/systematics methodologies and for the evaluation of molecular clock based timing models.
principal investigator on
keywords
- angiosperms
- biomedicinals
- floral evolution
- phylogenetics
- plant evolution
- plant systematics
- pollination
- timing
submitted impact statement
Publications
individual publications
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academic article
- Darwin’s second 'abominable mystery': Why are there so many angiosperm species?. American Journal of Botany. 96:366-381. 2009
- Is the anthophyte hypothesis alive and well? New evidence from the reproductive structures of Bennettitales. American Journal of Botany. 96:296-322. 2009
- Pentapetalum trifasciculandricus gen. et sp. nov., a thealean fossil flower from the Rarittan Formation, New Jersey USA (Turonian, Late Cretaceous). American Journal of Botany. 96:933-949. 2009
- Introduction. Annals Missouri Botanical Garden. 95:1-2. 2008
- Selection of fossils for calibration of molecular dating models. Annals Missouri Botanical Garden. 95:34-42. 2008
- The fossil record of angiosperms: requiem or renaissance? . Annals Missouri Botanical Garden. 95:3-33. 2008
- Impact of extinct taxa on understanding the early evolution of angiosperm clades: an example incorporating fossil reproductive structures of Saxifragales. Plant Systematics and Evolution. 260:141-169. 2006
- An extinct calycanthoid taxon, Jerseyanthus calycanthoides, from the Late Cretaceous of New Jersey. American Journal of Botany. 92:1475-1485. 2005
- Cretaceous flowers of Nymphaeaceae and implications for complex insect entrapment pollination mechanisms in Early Angiosperms. Proceedings at the National Academy of Science USA. 101:8056-8060. 2004
- Fossil evidence and phylogeny: the age of major angiosperm clades based on mesofossil and macrofossil evidence from Cretaceous deposits. American Journal of Botany. 91:1666-1682. 2004
- Divisestylus gen. nov. (aff. Iteaceae), a fossil saxifrage from the Late Cretaceous of New Jersey, USA. American Journal of Botany. 90:1373-1388. 2003
- Triuridaceae fossil flowers from the Upper Cretaceous of New Jersey. American Journal of Botany. 89:1940-1957. 2002
- The earliest fossil evidence of the Hamamelidaceae: Late Cretaceous (Turonian) inflorescence and fruits of Altingioideae. American Journal of Botany. 88:753-766. 2001
- Turonian Pinaceae of the Raritan Formation, New Jersey. Plant Systematics and Evolution. 226:187-203. 2001
- Progress in understanding angiosperm history, success, and relationships: Darwin's abominably “perplexing phenomenon”. Proceedings of the National Academy of Sciences (PNAS). 97:12939-12941. 2000
- Sorophores of the genus Lygodium from the Late Cretaceous of New Jersey. Plant Systematics and Evolution. 221:113-123. 2000
- Early plant history: something borrowed, something new? . Science. 285:1673. 1999
- A new fossil flower from the Turonian of New Jersey: Dressiantha bicarpellata gen. et sp. nov. (Capparales) . American Journal of Botany. 85:964-974. 1998
- Fossil Clusiaceae from the Late Cretaceous (Turonian) of New Jersey and implications regarding the history of bee pollination. American Journal of Botany. 85:1112-1133. 1998
- Oldest known fossil flowers of monocotyledons. Nature. 394:532-533. 1998
- The abominable mystery. Science. 282:1653-1654. 1998
- Two new fossil flowers of Magnoliid affinity from the Late Cretaceous of New Jersey. American Journal of Botany. 85:1273-1288. 1998
- Tylerianthus crossmanensis gen. et sp. nov. (Aff. Hydrangeaceae) from the Upper Cretaceous of New Jersey. American Journal of Botany. 85:376-386. 1998
- A new fossil fern assignable to Gleicheniaceae from Late Cretaceous sediments of New Jersey. American Journal of Botany. 84:483-493. 1997
- Timing in the evolution of derived floral characters: Upper Cretaceous (Turonian) taxa with tricolpate and tricolpate-derived pollen. Review of Palaeobotany and Palynology. 90:339-360. 1996
- A reevaluation of seed plant phylogeny. Annals Missouri Botanical Garden. 81:484-533. 1994
- Fossil flowers and pollen of Lauraceae from the Upper Cretaceous of New Jersey. Plant Systematics and Evolution. 189:29-40. 1994
- ORIGIN AND DIVERSIFICATION OF ANGIOSPERMS . Encyclopedia of Biodiversity second edition. . 1994
- Chloranthus-like stamens from the Upper Cretaceous of New Jersey. American Journal of Botany. 80:865-871. 1993
- Late Cretaceous fossil flowers of ericalean affinity. American Journal of Botany. 80:616-623. 1993
- The oldest fossil flowers of hamamelidaceous affinity - implications for the origin of petals in the hamamelidid/rosid lineage. Proceedings of the National Academy of Sciences (PNAS). 89:8969-8989. 1992
- Earliest fossil evidence of grasses in the fossil record. Americal Journal of Botany. 78:1010-1014. 1991
- Fossil evidence for the evolution of biotic pollination. Philosophical Transactions of the Royal Society. 333:187-195. 1991
- Extinct transitional Fagaceae from the Oligocene and their phylogenetic implications. American Journal of Botany. 76:1493-1505. 1989
- The earliest megafossil evidence of Fagaceae: phylogenetic and biogeographic implications. American Journal of Botany. 76:842-855. 1989
- Trigonobalanus: taxonomic status and phylogenetic relationships. American Journal of Botany. 76:828-841. 1989
- Fossil floral evidence of Malpighiaceae and an early plant-pollinator relationship. Americal Journal of Botany. 74:274-286. 1987
- A new burrower bug (Heteroptera: Cydnidae) from the Paleocene/Eocene of Tennessee. Journal of the New York Entomological Society. 94:296-300. 1986
- Pollen wall structure of Caytonanthus arberi. Plant Systematics and Evolution. 153:259-264. 1986
- Primitive mimosoid flowers from the Paleocene-Eocene and their systematic and evolutionary implications. Americal Journal of Botany. 73:548-563. 1986
- The diversification of the Leguminosae: first fossil evidence of the Mimosoideae and Papilionoideae. Science. 288:1087-1089. 1985
- Advanced (constant) insect pollination mechanisms: patterns of diversification and implications vis a vis angiosperm diversity. Annals Missouri Botanical Garden. 71:607-630. 1984
- Euphorbioid inflorescences from the Middle Eocene Claiborne Formation. Americal Journal of Botany. 69:258-266. 1982
- Lower Eocene and Paleocene Gentianaceae: floral and palynological evidence. Science. 214:75-77. 1982
- The evolutionary significance of Quercus sect. Erythrobalanus from the Oligocene of East Texas. Americal Journal of Botany. 70:639-649. 1982
- Investigations of angiosperms from the Eocene of North America: flowers of the Celtidoideae. Americal Journal of Botany. 68:924-933. 1981
- Castaneoid inflorescences from the Middle Eocene of Tennessee and the Diagnostic value of pollen (at the subfamily level) in the Fagaceae. Americal Journal of Botany. 67:739-757. 1980
- Investigations of Tertiary angiosperms: Eomimosoidea plumosa from the Lower Oligocene of eastern Texas. Americal Journal of Botany. 67:309-320. 1980
- Investigations of angiosperms from the Eocene of North America: a new juglandaceous catkin. Review of Paleobotany and Palynology. 30:361-370. 1980
- Insect pollination: a paleontological perspective. BioScience. 29:102-108. 1979
- Some aspects of the pollination biology of Middle Eocene angiosperms. Review of Paleobotany and Palynology. 27:213-238. 1979
- A reinvestigation of the fossil Viguiera cronquistii (compositae). Brittonia. 30:483-491. 1978
- Investigations of angiosperms from the Eocene of North America: an aroid spadix. Review of Paleobotany and Palynology. 25:241-252. 1978
- Investigations of angiosperms from the Eocene of North America: a mimosoid inflorescence. Americal Journal of Botany. 64:714-725. 1977
- Investigations of angiosperms from Eocene of North America: juglandaceous winged fruits. Americal Journal of Botany. 63:532-544. 1976
- The reproductive and vegetative morphology of a Cretaceous angiosperm. Science. 191:854-856. 1976
- Investigations of angiosperms from the Eocene of North America: a catkin with juglandaceous affinities. Americal Journal of Botany. 62:813-823. 1975
- Eocene angiosperm flowers. Science. 185:781-782. 1974
- Investigations of North American cycadeoids: the reproductive biology of Cycadeoidea. Palaeontographica. 148B:144-159. 1974
- Genetic variation in Lycopodium lucidulum: a phylogenetic relic. Evolution. 27:622-632. 1973
- Investigations of North American cycadeoids: Pollination mechanisms in Cycadeoidea. Americal Journal of Botany. 59:1048-1056. 1972
- Investigations of North American cycadeoids: early ovule ontogeny. Americal Journal of Botany. 59:209-215. 1972
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article
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booksection
- Origin and Diversification of Angiosperms. Vol. 5. 2013
- Insect interactions: insect pollination 2001
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chapter
- The Bennettitales (Cycadeoidales): a Preliminary Perspective on this Arguably Enigmatic Group. Plants in Mesozic Time: Morphological Innovations, Phylogeny, Ecosystems. 214-244. 2010
- The fossil history of stamens. The anther, form, function and phylogeny. 25-57. 1996
- Flowers of Turonian Magnoliidae and their implications. Early Evolution of Flowers, Plant Systematics and Evolution, Suppl 8. 73-91. 1994
- Fossil History of the Leguminosae: phylogenetic biogeographic implications. Advances in Legumes Systematics, Part 4. The Fossil Record. 303-316. 1991
- Fossil papilionoid flowers from the Palaeocene - Eocene of southeastern North America. Advances in Legumes Systematics, Part 4. The Fossil Record. 43-56. 1991
- The history and implications of the early North American Fossil Record of Fagaceae. The Hamamelidae. 45-66. 1989
- The evolution of insect pollination in the angiosperms. The Origins of Angiosperms and their Biological Consequences. 181-201. 1987
- Time of appearance of floral features. The Origins of Angiosperms and their Biological Consequences. 145-179. 1987
- The origin and history of insect pollination. Pollination Biology. 29-50. 1982
- The status of certain families of the Amentifere during the Middle Eocene and some hypotheses regarding the evolution of wind pollination in dicotyledonous angiosperms. Paleobotany, Paleoecology, and Evolution. 103-128. 1981
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conference paper
- The oldest complete fossil flowers of Nymphaeaceae and implications for the complex insect entrapment pollination mechanisms in Early Angiosperms. Proceedings of the National Academy of Sciences. 8056-8060. 2004
- Turonian flora of New Jersey. VII International Symposium on Mesozoic Terrestrial Ecosystems, Buenos Aires, Argentina; Asociación Paleontológica Argentina, Publicación Especial. 62-97. 2001
- Monocotyledons: A review of their Early Cretaceous record. Proceedings of the Second International Conference on the Comparative Biology of the Monocotyledons. 44-52. 2000
- Preservation of genetic diversity. Sustainable Development and Biodiversity: conflicts and complementarities. Proceedings from Symposium and Workshops at Cornell University. 51-55. 1991
- The Ultrastructure of Caytonanthus pollen: evolutionary implications. Fourth Northeast Paleobotanical Conference. 1981
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document part
- Darwin’s second “Abominable Mystery” What are there so many angiosperm species. 560. 2008
- Is the anthophyte hypotheseis alive and well? New evidence from seeds and cones. 549. 2008
- A Cretaceous Atlantic Coastal Plain Ericoid Complex. 62. 2001
- A new fossil saxifragoid from the Upper Cretaceous of New Jersey. 69. 2001
- Fossil flowers with possible nymphaealean affinities. 64. 2001
- Origins of Fagaceae: a review of relevant Turonian fossil material from New Jersey. 68. 2001
- Studies on Turonian Pinaceae of the Raritan Formation, New Jersey. 187-203. 2001
- A Turonian inflorescence bearing perigynous flowers of a lower rosid affinity. 66. 2000
- A phylogenetic analysis of modern and Cretaceous Triuridaceae. 80. 1998
- Species diversity of Triuridaceae fossil flowers from the Late Cretaceous of New Jersey. 117. 1998
- The appearance of floral innovations in the Cretaceous and implications regarding angiosperm diversity. 185. 1997
- The oldest know fossil flower with affinities to the modern family Triuridaceae. 196. 1997
- A fossil flower with affinities to the order Capparales from Late Cretaceous sediments of New Jersey. 157-158. 1996
- A new delleniid flower from the Late Cretaceous of New Jersey. 113. 1996
- Patterns in the appearance of floral innovations in the Cretaceous and their implications. 20. 1996
- Turonian flowers of the Theales. 148-149. 1996
- Bennettitales-Homology assessment and its effect on cladograms. 85. 1995
- Fossil flowers with hydrangeacean affinity from the Late Cretaceous of New Jersey. 85. 1995
- Timing in the evolution of derived floral characters: Upper Cretaceous (Turonian) taxa with tricolpate and tricolpate-derived pollen. 17. 1995
- A unique mid-Cretaceous flower in the subclass Magnoliidae. 150-151. 1994
- Timing in the evolution of floral character comlexes associated with insect pollination. 151. 1994
- A sympetalous caryophylloid flower from the Late Cretaceous of New Jersey. 92. 1993
- Cretaceous (Turonian) flowers of Magnoliales, phylogenetic, biogeographic, and ecological implications. 88. 1993
- Floral diversity from the Cretaceous (Turonian) and its systematic and ecological implications. 141. 1993
- Fossil reproductive structures of Lauraceae and Chloranthaceae from the Late Cretaceous of New Jersey. 90. 1993
- Phylogeny within angiosperms and major clades of angiosperms. 125. 1993
- The relationships of seed plants in reference to angiosperm outgroups. 123. 1993
- A preliminary summary of the Tertiary fossil record of legumes in North America. 176. 1991
- Pollen variability in lower Rosidae. 110. 1991
- Paleocene-Eocene grasses from the southeastern USA. 161. 1989
- Paleogene Fagaceae of Western North America. 208. 1988
- A transformation series in pollen micromorphology in Fagaceae and its phylogenetic implications. 729. 1987
- Pollen structure and variability in Pistillipollenites macgregorii, a paleocene gentian. 698. 1986
- The earliest fossil evidence of Fagaceae and its implications. 758. 1986
- Trigonobalanus (Fagaceae): taxonomic status and phylogenetic relationships. 778. 1986
- A preliminary analysis of the fossil history of Quercus and other genera of the Fagaceae. 930. 1985
- Floral evidence of pollination mechanisms in fossil angiosperms. 58. 1985
- Floral evidence of the Malpighiaceae from the Middle to Upper Eocene of Tennessee. 902. 1985
- Fossil floral evidence of the Mimosoideae and Papilionoideae (Leguminosae). 948. 1985
- Insect pollination mechanisms: an analysis of the fossil data. 42. 1985
- Preliminary phylogenetic reconstruction of Quercus and subgeneric and sectional levels. 934. 1985
- Quercoid catkins from the Middle Eocene. 161. 1983
- The impact of constant pollinators on angiosperm diversity. 160. 1982
- Middle Eocene inflorescences of the Euphorbiaceae. 158. 1980
- Investigations of Tertiary angiosperms 1979
- Investigations of angiosperms from the Eocene of North America: flowers of the Ulmaceae 1979
- Investigations of angiosperms from the Eocene of North America: inflorescences of the Fagaceae 1979
- A re-evaluation of the fossil composite Viguiera cronquistii. 79. 1978
- Dillenioid flowers from the Middle Eocene 1978
- A spadix-like inflorescence from the Middle Eocene of the southeastern United States 1976
- A catkin like inflorescence from the Middle Eocene Claiborne Formation. 18. 1975
- Floral structures and pollination mechanisms of the Claiborne flora in western Tennessee and western Kentucky. 18. 1975
- Juglandaceous leaflet remains. 19. 1975
- The reproductive and vegetative morphology of a Cretaceous angiosperm. 19. 1975
- Investigations of angiosperms from the Eocene of southeastern North America: a new catkin from Tennessee. 14. 1974
- Cone development in Cycadeoidea. 660. 1972
- Pollination of Cycadeoidea. 660. 1972
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report
-
review
- Paleoflora of South Africa 1987
- The Fossil Hunters: In Search of Ancient Plants. 149. 1982
- Origin and Early Evolution of the Angiosperms. 692-693. 1976
Teaching
teaching overview
- My overall view of teaching is exemplified in my teaching focus for Plant Biology 448, Plant Evolution and the Fossil Record, where the emphasis is on the integration of the fossil record with evolutionary theory in an ecological setting. This course involves hands on experience with study of fossils in the laboratory giving students the opportunity to observe directly the past diversity of life. This diversity is given structure in the form of phylogenetic context-a correlate of the evolutionary process and one that incorporates theory and important developments in molecular genetics, that is then related back to evolutionary theory in an ecological setting. The course is divided into lecture and laboratory with the lecture emphasizing major issues in evolutionary biology, systematics and key steps in plant evolution rather than being solely a compendium of facts. Testing is done in laboratory to insure that essential fact based learning is accomplished but lecture exams are conceptual and synthetic in nature and require the cogent presentation of structured arguments that are well reasoned and thoroughly evidenced.
teaching activities
- BIOPL-4480: Plant Evolution and the Fossil Record - Spring 2013
- BIOPL-7400: Plant Biology Seminar - Spring 2013
- BIOPL-7490: Graduate Research in Botany - Spring 2013
- BIOPL-7400: Plant Biology Seminar - Fall 2012
- BIOPL-7490: Graduate Research in Botany - Fall 2012
- BIOPL-4480: Plant Evolution and the Fossil Record - Spring 2012
- BIOPL-7400: Plant Biology Seminar - Spring 2012
- BIOPL-7490: Graduate Research in Botany - Spring 2012
- BIOPL-7400: Plant Biology Seminar - Fall 2011
- BIOPL-7490: Graduate Research in Botany - Fall 2011
Service
outreach overview
- My focus is on assisting in establishing the web based equivalents of the widely used horticultural publications Hortus and Bailey`s Manual. These publications have significance that goes beyond the practicalities of horticulture in NYS and includes biodiversity characterization important in identifying species distribution changes that might be related to climate change, invasive plant species etc.. The web based equivalents will have much more information than was available in the original publications and be structured to provide relevant information to a broader constituency
service to the profession
- BOYCE THOMPSON INSTITUTE Board of Trustees 2005 -
- Boyce Thompson Institute, Research Oversight Committee Committee Member 2005 -
- Science Advisory Committee, Vermont Institute of Natural Sciences Committee Member 2002 -
- International Organization of Paleobotany Member 1980 -
- American Association for the Advancement of Science Member 1972 -
- Botanical Society of America Member 1970 -
- Paleobotanical Section Member 1969 -
- American Association of Stratigraphic Palynologists
- Association of Yale Alumni
- Explorers Club
- Sigma Xi
- Smithsonian Institution Museum of Natural History Committee Member 2010
- Smithsonian Institution U.S. Natural History Museum, 2009 Professional Accomplishments Evaluation Committee Committee Member 2009 - 2010
- AI-SPER-0203DF692AB00010861 Organizer of Symposium: Paleobotany in the Post Genomics Era 2006
- Paleontological Research Institute Board of Trustees 1991 - 2006
- Australian Research Council Expert Assessor of International Standing - 2002
- Senior Vice President Search Committee, New York Botanical Garden Committee Member - 2002
- New York Botanical garden Scientific Consultant 1999 - 2000
- Boyce Thompson Institute, Presidential Search Committee Committee Member - 1999
- Paleontological Research Institute, Museum Architect Selection Committee Committee Member - 1998
- Paleontological Research Institute, Museum Exhibition Committee Committee Member - 1997
- David Starr Jordan Prize Committee, Stanford University Committee Member - 1991
- AI-SPER-0203DF692AB00010935 Officer, Secretary - 1980
- AI-SPER-0203DF692AB00010934 Chairperson - 1979
reviewer or editor for
event host
- Genetic and genomic analyses of shoot apical development
- Indentification of genes that regulate Rubisco accumulation in higher plants
- Phylogenetic Affinities and evolution of Patagonian Vegetation
- Towards molecular understanding and genetic manuipulation of plant senescence for enhancing crop yield and bioenergy production
Background
education and training
- Ph.D. in Biology, Yale University 1973
- Yale University 1971
- B.A. in, Harpur College 1969
awards and honors
- The Ermine Cowles Case Memorial Lecture, 2012
- Keynote Address, 2010
- Botanical Society of America Merit Award, 2007
- Maynard F. Moseley Award, 2001
- Moseley Award for Excellence in Plant Structural Biology, 2000
- Distinguished Consultant to the New York Botanical Garden, 1999
- Special Merit Award, 1985
- Special Merit Award, 1980
- Early promotion to Associate Professor, 1979
- Special Merit Award, 1979
- Elected Fellow of The Explorers Club, 1979
- Sigma Xi, 1977
- Listed Member, 1973
- Paleobotanical Prize (Cookson Award), 1972
- Joseph F. Cullman Fellowship, 1972-74, 1972
- American Men and Women in Science, 1972
- Daniel Cady Eaton Fellowship, 1971-1972, 1971
- Dudley L. Wadsworth Fellowship, 1969-71, 1969
- New York State Regents Scholarship, 1964-68, 1964
- Joseph F. Cullman Fellowship
- Daniel Cady Eaton Fellowship
- Dudley L. Wadsworth Fellowship
- New York State Regents Scholarship
Other
college
- CALS
research keyword
- angiosperms
- biomedicinals
- floral evolution
- phylogenetics
- plant evolution
- plant systematics
- pollination
- timing
name prefix
- Dr.